Given an alternating sign matrix or a permutation in 1-line notation, outputs Fulton's essential set, i.e., the maximally southeast elements of the Rothe diagram of that alternating sign matrix or permutation.
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The object essentialSet is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/MatrixSchubert/MatrixSchubertConstructionsDOC.m2:747:0.